Hi Vincent,

On Thu, May 17, 2012 at 09:51:55AM +0000, vincent cui wrote:
> 
> It is really odd...

This is not.


> I enable display lwip stats, it shows that there is packet dropped..  

So, lwIP probably knows it had to drop the SYN packet, you only need to 
find out why.

Again, you HAVE TO get and check a TCP trace first in order to be able 
to know where to look.


Sylvain

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